1. The problem statement, all variables and given/known data a) A jet fighter has two engines each generating 70,000 N of thrust. What is the acceleration of the 15,000 kg jet? b) The above jet reaches a final velocity of 240 m/s. What is the frictional force on the jet? 2. Relevant equations Ff= Fn(mew?) F=MA ? 3. The attempt at a solution Okay, so for the first part (a) I got 4.66 m/s squared as my acceleration. I need to know how to get the answer for part b.